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** Copyright (C) 2019 The Qt Company Ltd.
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** This file is part of Qt Creator.
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** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
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#include "preprocessormacrocollector.h"

namespace ClangPchManager {

namespace {
PreprocessorMacros toSortedMacros(const ProjectExplorer::Macros &macros)
{
    PreprocessorMacros sortedMacros;
    sortedMacros.reserve(macros.size());

    for (const ProjectExplorer::Macro &macro : macros)
        if (macro.type == ProjectExplorer::MacroType::Define)
            sortedMacros.push_back({QString::fromUtf8(macro.key), QString::fromUtf8(macro.value)});

    std::sort(sortedMacros.begin(), sortedMacros.end());

    return sortedMacros;
}
} // namespace

void PreprocessorMacroCollector::add(const ProjectExplorer::Macros &macros)
{
    PreprocessorMacros sortedMacros = toSortedMacros(macros);
    std::sort(sortedMacros.begin(), sortedMacros.end());

    PreprocessorMacros mergedMacros;
    mergedMacros.reserve(sortedMacros.size() + m_macros.size());

    std::set_union(m_macros.begin(),
                   m_macros.end(),
                   sortedMacros.begin(),
                   sortedMacros.end(),
                   std::back_inserter(mergedMacros));

    m_macros = mergedMacros;
}

const PreprocessorMacros &PreprocessorMacroCollector::macros() const
{
    return m_macros;
}

} // namespace ClangPchManager
